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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e531429d76041b59f8344c83b178f4f0684f53d7b1faa79c143907c0ed7b923e' 
  AND token = 'd+4lVywHKA72y0ROFaEyEoDeYqLyu1IwPONeWfC8iLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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