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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbcd67988f1def9fa9b8325bd6cfe89e40055d196545708cae6b61e20e045b8d' 
  AND token = 'sUv+uafAXRfOkXt+b6N7bN3Y3hmsOKmsnOIU6m9A5yU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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