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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d58cc3e125635011cf0b03cc3a8366e937fec8a8a9293ba4b9bb4681b7f1abc' 
  AND token = 'EQm72ihG9G91wrrjAUmp2zni+xOo9MCXAK5dAG5biXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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