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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89ca2e1043f42db73cb59c780c12369291f3846a23dc6e05a600099a53c1370d' 
  AND token = 'nLf8B4/pxlSLlKWXDcZiroywMSaQRxe6X377+053XQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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