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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6830b6d1505f56eaa49142995fb9480c7ff67bebf9ea9cfb9cf5b93e8fdb95ee' 
  AND token = '13Bg6NsXdi9Q7PHtx38G6FFGKrO8FqVRplhuMDabgRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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