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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dd374139131b605a2d955bf098a469b9c31b6f1d6352a59b9df44a7c20434a6' 
  AND token = 'qw3yFx/MIuyy74l7K3fq/QPhjpQFEjLftl90LSsMy7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00072

JSON explain

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