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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '030e7e017f4a61dd7b5d5eaf5faf033c6ae9c5891a8c8845cb8720f44068c384' 
  AND token = 'PS1/a8e0DRmwqKnyNikMnDrK3sFy9PIVRxjzGJcIhtw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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