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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68cc4e2a91d27518f454b67a4be7943c9c94ff17cf115aa99febf51408a3ee23' 
  AND token = 'zjLWWzaed6zxew0LXLxJdeuY5xgeOEbI7uMtriOPVrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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