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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13eeff402bb3c110ca173a7b5536ea73da48bbe06e391e73d575d3378026f06d' 
  AND token = 'ObR7OniSBmIo2e9941BuV8Hl1yI4oHqS1ARE0JJjsVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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