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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '029e725979f4e1b3999c602664ca37634f37c8ec17807fd7e16fc2db7d35b8bc' 
  AND token = 'DfagLI0UlwCnh3isrjU4wpvxyiyrHV4tVqLOnbUz3vI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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