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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b8458e12bd3bac22817507f9b53c85862f02edf8e4b6e9ecaaad93565593509' 
  AND token = 'UEwq8SH0U2OHQ/etfExcPLIdeFnfCb6pHXTmp9fAoAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00148

JSON explain

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