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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcf416e14d864b8b712101132b37531ff7e0409991c9a34116ed771feabab7b9' 
  AND token = 'qwCJP39ex0yFSAsj9ZiuQGUuS245kir6wwgShsXfCdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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