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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dad2181edc9649c0207c198b0af0c95cdc721f5c65bf92a102cc065924f6b7f6' 
  AND token = 'SiWPMfb4H0TBrD3H9llw3JPub47EBTQLe4ViSxXYiHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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