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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbe86b98e0e245fe47f8f790f4b05db06edc3774a6afbe064ac5e44228107f0b' 
  AND token = 'UnLtNC8EmvXzLKh0vMR4V4C1ROJgmvVOw8+9DTy/wec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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