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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2db30fbfd79b0b78851b1d3c51cceb609c4ad5641ad6d8e36a0bebe625d13231' 
  AND token = 'MqKZslB6K9ZRedo/YVTYwt2T4RUzs/1z6TSpISwlLzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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