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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ac28f726ba252f8b65ff48309ec80131ef41661c4ec06f52e6dd3eeb90c6db2' 
  AND token = 'E0swxM0l7BZh1lu+HIRuO5BWQk5n3WwKptJGJLIf9yI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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