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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d25c1e147fe16104ff4115ab18921b58318c4a4ab32315bf5d0fe1fe35fe64b' 
  AND token = 'D98u32ZFSCXudES5vm4pV1K/e8JyC4Llsnayl7ZnedU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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