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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19ceecbfd3a37f22355476e40a3accdf390a8ddd2535e1e79d8fb5ba2e47deb7' 
  AND token = 'bKDhoSOLd3fXXXuE9F5xVgfviBiOeAiLH4B7gJfgmWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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