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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edf92dd411ef83d09efed6d250792a3bd0d4624bbbe55c3a9c6fa92dc9b578c6' 
  AND token = 'XrJfXZs5FAQcasaL579UnqMf4Na7uTw4ozVktIdAaO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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