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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b13f2a263b3108500f5aa8f85dc364f4fc9bf7ff0607378bb6a5c71d2a29344' 
  AND token = '9vX/+EfSIFCFMvb8E+WEvrfDz7QXiuMZVNODXCT8rqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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