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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67237aa21b20d7af69070e4fa0c8428069dcae7f280b1b68eebe3ca7f9899d45' 
  AND token = 'ae7UDKdZRf6gBuy/3z6YMbAIJZAKKdgzqN16htEJii0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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