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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aab8c4f31c2231e099472f7515dfd8b096da9795c577f9564e9704b8ca04d78a' 
  AND token = 'Pl8/TMZZdkUd8WdoxMSfIF5Vxx6KsgiyLp6mlKkhIKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00079

JSON explain

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