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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36f7dbc12ffde246340b1d9c2764a28640f576093bbaa8ebbc129796c10323e8' 
  AND token = 'h4N9w7N4Ntf5DuBN/NypON701p67Th0SQZjurYTFrEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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