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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8d295e372dc50c6d5b8bbf037b56a7a64dc7e05ae3d1c0ca1105d4bd3773933' 
  AND token = 'aYCv4GvohdIBegXq5nprH7gzbpYYiYYwPkgOBYIkdi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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