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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3aeed16b5e10a05b178e3ea8eee709b3d549025c845e6ab91ed221c61cae6275' 
  AND token = 'iHb4LEBSLrPJtO6v7nkX6YqyKRsb1pepU334PYxLX78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}