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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0d0f8f481cabcc383d3d9bba87e8f4a2749c8a5837dea3b8312a52b03cb1b20' 
  AND token = 'WDr9t1+l92zQA3KewbYXe9klL63Cnn5ODnF9PN808Ic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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