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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd94f7e7ed83d437d30fb97b2d3fee1cb3a965b6a4fb15716d8b7e36b35b9804' 
  AND token = '5D25s/36pgF0XzpWulabANrLOmSYNS0zyXrk2Xisu/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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