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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '939a141cb69306e8a273badda2ec797faf02dd389b24ffd53491c427e4fb1017' 
  AND token = 'M1QdF8xAE67RlFNgd3H0VkwB3y4sk0j8J/wH6tE5Sj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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