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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f2d866c540db7a5a00dc59e6982cf6d33f2a3764118482c84f68eb7c124a3ba' 
  AND token = '0oh+3P1wZufNrbczfLwM9D0AMhmTk1tUM2Ri9xsdYg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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