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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab590aa50ffdabfb1200d9cb01bfc9cf9d802171d56f437e685c6ad5ad8412ef' 
  AND token = 'JS3syO/jlqkVbdXFsu3cUDC/r2eN3fC84OeVoyeIWYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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