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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a74da55e1d0c767a628037c4604a3b75e94165ab7fe510c26ff757495098bae3' 
  AND token = 'ThNwkSEAh/9Yrtj8IWqmyjqrGPuamVRM9kQcxqQhno8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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