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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19ea430e96e3f5c9d6e043bda1737b2f8f645ed5a9efdd8e11ad17d2c2f7fde2' 
  AND token = 'hDS/7EJucnbVgUkl6BSpKs/el/2PqgOBaD71iH86VNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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