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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9a17c3c6bab15ddfb7507c2950266d2f169a6fc0ba426f19bbd4d89df771b1d' 
  AND token = '/4AKT8bE8dqZLnCX5auPY/0EFpdx3a/yqL5RnxcFbHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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