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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1504c5f1fb744bf25c569216ef8ffb9e2f37816569adcaeb28b9b21ad840fac' 
  AND token = '5lOJlSmosMw6MAIn6l30xgMx4tJKmTPmifM1EDj70Qw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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