SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d7b7bab67ed6ec1c1cd50c4b344ffb18def57ac5d516f6c122792c941230ff7' 
  AND token = 'zZyeBRq/Lk/31sWUgqq/GnHTgdjDzv5wNW8xP6waHm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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