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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '397705d84865480719a833530d674237494df854d7204bebb577b2a1e85410a6' 
  AND token = 'r6WYp9TQS1lUtrGWea4+/+9sLb1eeW6XWiziFBTwZtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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