Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b19e1ad1280d4a3fe3ca9057a0d5b286a5517dfc2a16f713347feb1a401d83c6' 
  AND token = '66XSh5sQHbqui0OEuET71yKkM2NiqXEOJvAaFonqQJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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