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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84ae67f23574f2881baea1d86b4fd2cc33e1ea88d6d7debce0d0fc5a5816534b' 
  AND token = 'glZ+9D/pwmPNSB/mSQp0Athq/ePUyoqZHB30AUvebjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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