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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3172659dd9394175f0694eda26e6854c5159df902e3b200a22bd46c9745f63a' 
  AND token = 'P14mx/9xTbNs0qdm4ieN4/dzotLh8wPOuaTi//Q2w90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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