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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e2efba041b966d7ae3e9e95a9d041f8b9b45b147211850ad665bb39b32aebdd' 
  AND token = '/TVbKmOlq5Q2jK1L0f2EqGlvjnYT5SzoasbEa3hKVTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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