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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e1baa7f799446ce2c86ba4ceb12cbb5aec59595a6eefe4e190b0f58253793c2' 
  AND token = 'A23wO1jifW7Pri5+RX98hVVjfrIzudG0eOLff+7gyPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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