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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae428944ec22a6e27fee7a13b6887e46e806f03010d0c82ba17d09a85e916c81' 
  AND token = 'TT5706GSwnZu4p+D4oosFYyiyNrey30BJgDyvSdRn8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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