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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27ec30dccbc3a22a63b38c4403fbccd0dfd346b1a61d2c22b88f8fb656b03264' 
  AND token = 'legzkuCyiNrDAzP8/XWwIKZnU3aB+FKlIBCkLcU6wGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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