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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b12e76928e2eb080a389efbcdc061f9d914dfae1ce79f726291ad6010071d9a' 
  AND token = '8iwDKzs+9I/kfM9OwKz15P7x2smZP3gV7T97LAazlHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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