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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd34c7257485061f5a47f8dc0a57e604615061de1a83d5530d89e26b8e5f38107' 
  AND token = 'CPtM6cMwHGH/t2uD4PT6zyHjngLHG5k5giKMMQ1HqaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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