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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '032f1b260824916fb3e86218f047b73c0246564892558de204d9904133025c37' 
  AND token = '5sdKuszijVohWQwbjF43ih3cN9FOrRTodynYgtFhf9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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