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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf63754a39c15f1332a3bc617011ea2714f4027b6b9d912c065d7eee2e6668e0' 
  AND token = 'hjq+fEZcWuL7Vvs0ctxsHESLS01SNhp0pSZB2c7qGLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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