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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50df8b6447ab6cb02dd5ba8589aabd422561e2ac079673b23f613fbb9e29d8b9' 
  AND token = 'B2XUXQcEGnAmBy5Ht83z37e5hLG+1blVd/kozAki4D0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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