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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15a30b542bcb1d5e5d441935cd0f5c4331048c369bf9d35bf32d9214cd650a72' 
  AND token = 'wFZh3NF55ke+KEBkOqrAONnilY5BjPT9MaxQu3nk9jI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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