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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1674295cd4371d96121ac11e7e2c6be35b2bbcb0abbb1b7ad72e84eceb02e46b' 
  AND token = 'kooVP9pknlIGUgu4sTu5XlkTr2bwSTu964A4IVjsGhQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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