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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19e962cf08073a609038ceb3f1e9a2aabd923c5d84eb75b9fb14a4a0c7a6c905' 
  AND token = 'TJTe84v9KX8fj2WleBL6kn4NT3C6pUGQ56FNkq0gq5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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