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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8209aa67119abb71c1fe68869bc8ee7f9e2245033f1e9229df636f726a1675e' 
  AND token = '2Ct67MyS/12dbu2vlYnEOORyU6BHL2ExXg3pZMStBNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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