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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f771ce5b59f95fe8ffe02dde234a3fde8d6e965bccb7975fe801f5609a8bec38' 
  AND token = 'Z2EJc0zU+imsyBPD3Jrl6jrzh2gzqCXhlj/adXFjyAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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