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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '940c4b50c852665aabc3113b39344f84b3723c327768f146516b7bc4f690d207' 
  AND token = '5XWUMEQx8q7SQr19O5SCZBEssK1rqdzGqo9Q7vnNm/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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