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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0909e9eb4de53474431287c1894eeece26d255ee394fb7600f16b24d8cc21ab' 
  AND token = 'm6WCrZtO9pJxJv4hztcGULJrScfjjiZy7xb/W7XswVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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