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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b04f799b51249f543ece1255bfd94cd26f029e6c63a473ecae23ef5cef727fc2' 
  AND token = '7UgqpDlQCtr9FaaHvKOc5ABA5UycXWJolVt0D2nXnQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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