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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d1ab8a20fbc3a886146dd56778bb70fdecdd0f8befe16eb80328da943e9c765' 
  AND token = 'Y2fQokYDBZHGg0qxTaZIgto13H4yM2BQHRt7eOLE38U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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