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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69b573ba850908adf4fd4764a4f5b156ccc5679cdf7a42d8c8ce8dd6e844fd61' 
  AND token = '9rh3hj4Bu9AyTVDV6xotddmGfCpH8h1dqXeDxmX55Ac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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