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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '937f7470ca3d0348479526f0d30f56e2c344984d6e72bf6ce0505e45f8be4045' 
  AND token = 'o4iTwBM8CQ169oiGjzvlY03Zz/aKoJLLLFyrLA5z/B8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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