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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69c1c24bf9636d56a0f305f5bcf5b29b3c50fad091f9050d94449403afafbd7e' 
  AND token = 'y31+e7nNLtgRfeqFltlATrsVm0wn22FwH/0ekvQTcTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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