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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2ebe3631adb559ae382e89435362c7790572f0e7428b9215076ba33bc18b5fa' 
  AND token = 'Pjq60v7CXLnQEGcPx2ZdcdOt8mTCde9VPE5a0rEujCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00072

JSON explain

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