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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9ad169db8c6ff6369f8284c93a6a4f8d078f80f44dab580699aa595acf0048a' 
  AND token = '1sIgaSmhMrgvq9YogQ2mJZFBwAK00IRjGitlGkaoMbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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