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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '199a31bca0391df0fcec31e1f98308c12b14c2d7e1f7d93fe809a0ba8f4c4842' 
  AND token = 'xZD9/V7LTE1To4gMj6BAMtvMacX5Zoh+Vtw50HS2PYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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