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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98cefba06c0ab38f163ee3b721b1a47ba6733d9022795776b4a91766956f686a' 
  AND token = '0+mQzYKJK6u0UGsSr+ZtmpQmBPoHY2ePw7SWK1eeAbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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