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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4506975591c868aa38f718a2ae293cf1959138c26198332bd425af3ade235aba' 
  AND token = 'ofqsZs2d9bGSNtsAdY8EyhrJQx27TeLdBuf76uMjU84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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