SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '962b4a5e902831b1769096790f97b5a285fe2b16efb7a1c63d007129fe158dbe' 
  AND token = 'ZvlbrVxQhbzZ/wmZTfkAgja/B/k+so495U/dFGLz6HA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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