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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd54730e65700af6e006f90213f198ad8c8ab4aeca4461d2b49974c8d57ce1bff' 
  AND token = '10Yln5gV++9DDuN1BGdax2IRR+kya9nJNYWscWCd8xc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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