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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b461e85179a1ab606163ea44f20e6bc8c00fecb8199a6148629b251cc7cdaa0' 
  AND token = 'ZJeROM37A4E+aSnhDHQDl6judrdGCKBa7PnnOLWc7Uw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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