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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfaab355914f3e6834223b3f731d8e3cfc651bcaf748042772742c68c8d7c9e1' 
  AND token = 'aU+Ouc0BbLECn2FclwVm0C56t9KCng+vaOSMxf+mSdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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