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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55db7912846e1064a3ba363097350de8cc1d0f73d94b7b4e64482e59f26b8f68' 
  AND token = 'CDRDfEa1I9HgYpiaMzNjSaNNXz4r9eQzP9bLH5GUkCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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